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WO1997041993A1 - Cylindre de commande ameliore - Google Patents

Cylindre de commande ameliore Download PDF

Info

Publication number
WO1997041993A1
WO1997041993A1 PCT/NL1997/000254 NL9700254W WO9741993A1 WO 1997041993 A1 WO1997041993 A1 WO 1997041993A1 NL 9700254 W NL9700254 W NL 9700254W WO 9741993 A1 WO9741993 A1 WO 9741993A1
Authority
WO
WIPO (PCT)
Prior art keywords
cylinder
valve
pneumatic operating
space
operating cylinder
Prior art date
Application number
PCT/NL1997/000254
Other languages
English (en)
Inventor
Marinus Willem Nugteren
Original Assignee
Machinefabriek Sempress B.V.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Machinefabriek Sempress B.V. filed Critical Machinefabriek Sempress B.V.
Priority to DE69719508T priority Critical patent/DE69719508T2/de
Priority to AT97919773T priority patent/ATE233635T1/de
Priority to AU24129/97A priority patent/AU2412997A/en
Priority to EP97919773A priority patent/EP0907454B1/fr
Publication of WO1997041993A1 publication Critical patent/WO1997041993A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/204—Control means for piston speed or actuating force without external control, e.g. control valve inside the piston
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/30—Features relating to electrodes
    • B23K11/31—Electrode holders and actuating devices therefor
    • B23K11/314—Spot welding guns, e.g. mounted on robots
    • B23K11/315—Spot welding guns, e.g. mounted on robots with one electrode moving on a linear path

Definitions

  • the present invention relates to a pneumatic operat ⁇ ing cylinder for operating a tool in linear movement, wherein the operating cylinder comprises: a working cylinder which is divided by at least one piston arranged therein into at least a first and a second cylinder space, wherein the piston is connected to a piston rod onto which is fixed a spot welding electrode; and control means for controlling the movement of the piston, wherein the control means are connected to a compressed air feed channel and to an air discharge channel.
  • Such pneumatic operating cylinders are generally known. These are applied for instance in the form of spot welding cylinders in the automobile industry for making spot welds between the diverse components of the bodywork later forming an automobile and they are also used as drive for spot welding tongs.
  • the object of the present invention is to provide a linear operating cylinder wherein it is possible through a good control of the speed of the cylinder, for instance in the case of a spot welding cylinder, to cause the workpiece to be contacted by the electrode at a low speed and to cause the spot welding cylinder to be pressed on the workpiece with great force, wherein these operations take place at the greatest possible speed.
  • control means are adapted to connect the compressed air feed channel in a first position to the first cylinder space and to connect the second cylinder space to the air discharge channel via a choke valve
  • control means comprise an auxiliary valve which connects the second cylinder space to the discharge channel when the pressure in the second cylinder chamber is less than a predeter- mined factor times the pressure in the first cylinder chamber
  • these control means are adapted to connect the first cylinder space in a second position to the air discharge channel and to connect the second cylinder space to the compressed air feed channel .
  • the normal pressure prevails initially in the second cylinder chamber so that the piston is propelled at a high speed.
  • a back pressure develops gradually in the second cylinder chamber whereby the movement is slowed and contacting of the workpiece by the tool takes place at a low speed.
  • the second cylinder chamber is connected to the environment by means of a choke valve so that the pressure in the second cylinder chamber is decreased by the restriction formed by the choke valve.
  • control means are adapted to connect the compressed air feed channel in a first position to the first cylinder space and to connect the second cylinder space to the air discharge channel via a choke valve, wherein the control means comprise an auxiliary valve which connects the second cylinder space to the discharge channel when the pressure in the second cylinder chamber is less than a predeter ⁇ mined factor times the pressure in the first cylinder chamber, and the control means are adapted to connect the first cylinder space in a second position to the air discharge channel and to connect the second cylinder space to the compressed air feed channel .
  • At least the choke valve, the auxiliary valve and the non-return valve forming part of the control element are integrated into the working cylinder.
  • a switching part forming part of the control device is herein arranged outside the working cylinder and the switching part of the control device is connected to the working cylinder by two chan ⁇ nels which change function when the switching part is switched.
  • the con ⁇ trol device is arranged outside the working cylinder and comprises at least the choke valve, the auxiliary valve and the switching part.
  • Other attractive preferred em- bodiments are to be found in the other sub-claims.
  • figure 1 shows a sectional view of a first embodi ⁇ ment according to the present invention
  • figure 2 shows a sectional view corresponding with figure 1 in a second position
  • figure 3a shows a schematic view of a second embodi ⁇ ment of the present invention in a first position
  • figure 3b shows a view corresponding with figure 3a in a second position
  • figure 3c shows a view corresponding with figures 3a and 3b in a third position
  • figure 4 is a schematic view of a third embodiment of the present invention
  • figure 5 is a schematic view of a fourth embodiment of the present invention.
  • a spot welding cylinder 1 which is formed essentially by a cylindrical housing 2 which is closed on one end part by a cover 4 provided with a hinge 3. The housing is closed on the other side by a cover 5.
  • a first piston 6 which is connected by means of a piston rod 7 to a second piston 8 which is connected to the main piston rod 9 which extends through an opening arranged in cover 5.
  • Cylinder barrels 11 respec ⁇ tively 12 are arranged on the inside of housing 2 for guiding the relevant pistons 6 respectively 8 which are each provided with piston seals 13 respectively 14.
  • an element 15 which is enclosed in the housing between cylinder barrels 11, 12. Diverse components, to be elucidated hereinbelow, are accommodated in this element 15.
  • a channel 16 Arranged in cover 4 is a channel 16 which is con ⁇ nected on one side to a connection 17 and which debouches on its other side in the first cylinder chamber 18.
  • a second cylinder chamber 19 is situated on the other side of piston 6, while a third cylinder chamber 20 is situat ⁇ ed between the central element 15 and the second piston 8.
  • the third cylinder chamber 20 is herein connected to the first cylinder chamber 18 by means of a channel 21 extending through the auxiliary piston rod 7.
  • the housing 2 is provided with a connection 22 which debouches in a channel 23. This latter is connected to the second cylin ⁇ der chamber 19 by means of a choke valve 24.
  • Channel 23 is further connected by means of an annular non-return valve 25 to a second cylinder chamber 19.
  • Non-return valve 25 is arranged such that it opens only when the pressure in channel 23 is greater than the pressure in second cylinder chamber 19.
  • choke valve 24 is bounded on its inside by a wall 26 which is connected to the central element, while non- return valve 25 is received on its outside in the element 15 and rests on its inside against a valve seat formed by an internal ring 27.
  • the internal ring 27 is also con ⁇ nected to central element 15.
  • the actual annular body of non-return valve 25 is manufactured from flexible materi- al, for instance plastic.
  • a sleeve 28 which is slidable in axial direction around the auxil ⁇ iary piston rod 7.
  • the sleeve 28 thus adjoins the second cylinder chamber 19 and on its other side sleeve 28 adjoins the third cylinder chamber 20.
  • the movement of sleeve 28 is bounded on its right-hand side by means of a ring 29 connected to central part 15, while the other side of the stroke of body 28 is bounded by a shoulder 30 arranged thereon which can contact a corre- sponding shoulder 31 arranged on central part 15.
  • the sleeve 28 bears an 0-ring 32 which in the shown position forms a seal against the internal ring 27.
  • the initial starting point is the situation shown in figure 1, wherein a spot welding electrode which is arranged on piston rod 9 but not shown in the drawing must be moved toward a workpiece.
  • a spot welding electrode which is arranged on piston rod 9 but not shown in the drawing must be moved toward a workpiece.
  • com ⁇ pressed air under the nominal pressure is initially supplied via connection 17.
  • This compressed air is fed to the first cylinder chamber 18 via a channel 16 and also to third cylinder chamber 20 by means of channel 21.
  • pressure is hereby built up in the second cylinder chamber 19. This pressure will in theory be able to develop to double the value of the pressure in first cylinder chamber 18.
  • the second cylinder chamber 19 is connected by means of a choke valve 24 to the channel 23 which is connected to connection 22 and to the ambient .
  • the air collecting under pressure in the second cylinder chamber 19 will hereby exit to the outside via choke valve 24.
  • the movement will initially take place at a great speed, wherein as more pressure is built up in second cylinder chamber 19 despite the action of choke valve 24, the speed will be lower.
  • connection 17 is connected to the ambient and compressed air is supplied via connection 22.
  • non-return valve 25 which will open under the pressure of the compressed air supplied via connection 22
  • the first piston 6 will be moved to the left.
  • the first and third cylinder chamber 19 respectively 22 are both connected to the ambient via the connection 17. This movement will therefore continue until the original situation shown in figure 1 is once again obtained.
  • a spot welding cylinder designated as a whole with 35 and formed by a housing 36 and a control block 37.
  • a piston 38 which is connected to a piston rod 39.
  • This latter is provided on its end with a spot welding electrode 40.
  • a spot welding electrode 40 It is also possible to use the cylinder to drive spot welding tongs.
  • a main valve 41 in the form of a so-called 5/2 valve.
  • This valve is formed by a cavity 42 which is arranged in block 47 and in which a valve body 42 is movable.
  • the valve body 42 is urged by means of a spring 43 to its position furthest to the left.
  • the control block is further provided with four connections, i.e. a connection 46 for supply of compressed air, two connec ⁇ tions 47,48 for connection to the ambient and a control connection 49.
  • control block 37 is connected by means of two channels 50 respectively 51 to the first cylinder space 52 respectively the second cylinder space 53.
  • valve 44 When the welding electrode 40 reaches the workpiece the pressure in the second cylinder space 53 will fall whereby valve 44 will displace to the position shown in figure 3b. Valve 44 thus forms a direct short-circuiting of choke valve 45 whereby the space 53 is rapidly vented and the firm pressing-on is obtained. After welding the supply of compressed air to the control connection 49 is stopped, whereby the position shown m figure 3c is obtained.
  • the body 42 has herein returned to its original position wherein the connection 46 is directly connected to the second cylinder space 53 and the first cylinder space 52 is directly connected to the ambient. Due to the pressure difference occurring between the spaces 52 and 53 the auxiliary valve 44 is also moved back to its original position. It will be apparent that no non-return valve is necessary in the embodiment shown in figures 3a-3c. This is a result of the fact that the auxiliary valve is arranged on the feed side of main valve 42.
  • the embodiment shown in figure 5 corresponds sub ⁇ stantially with the embodiment shown in figure 4; the embodiment shown m figure 5 is provided with an electric switch 55 which responds to the position of valve 44.
  • This switch can be used to generate a signal which indi ⁇ cates when valve 44 moves or when in the present case the electrode 40 is pressed fixedly against the workpiece. Such a signal can be used to initiate the following process, for instance the welding.
  • the embodiment shown in figure 5 further differs in that it is provided with a pressure regulating valve 56.
  • a pressure regulating valve 56 This latter is connected in series to the parallel cir ⁇ cuit of choke valve 45 and non-return valve 54.
  • the pressure regulating valve 56 which is adjustable, en ⁇ sures that during the return movement of piston rod 39 the feeding pressure can be adjusted just sufficiently to move back the piston rod 39, whereby during the outward movement of piston rod 39 the speed becomes dependent on the adjusted pressure.
  • this pressure regulating valve 56 can also be applied in the configuration of figures 3a and 3b.
  • This pressure regulating valve is there connected in series to choke valve 45.
  • this pressure regulating valve can also be applied in the embodiment of figures 1 and 2; the valve will then have to be integrated into the element 15. It will be apparent that diverse other embodiments are also possible for the purpose of implementing the invention; essential steps are stated in the claims.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Robotics (AREA)
  • Actuator (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Resistance Welding (AREA)
  • Vehicle Body Suspensions (AREA)
  • Massaging Devices (AREA)
  • Glass Compositions (AREA)
  • Fluid-Damping Devices (AREA)

Abstract

L'invention concerne un cylindre de commande pneumatique destiné à commander le mouvement linéaire d'un outil. Ledit cylindre de commande comprend un cylindre de travail divisé par au moins un piston en au moins un premier et un second espaces de cylindre, le piston étant relié à une tige de piston sur laquelle est fixé l'outil; des moyens de commande destinés à commander le mouvement du piston, les moyens de commande sont connectés à un canal d'alimentation en air comprimé et un canal de décharge d'air, les moyens de commande étant adaptés pour relier le canal d'alimentation en air comprimé, dans une première position, au premier espace du cylindre, et pour relier le second espace du cylindre au canal de décharge d'air par l'intermédiaire d'une soupape d'étranglement. Lesdits moyens de commande comprennent une soupape auxiliaire reliant le premier espace du cylindre au canal de décharge lorsque la pression dans la seconde chambre du cylindre est inférieure à un facteur prédéterminé multiplié par la pression régnant dans la première chambre du cylindre. Les moyens de commande sont adaptés pour relier le premier espace du cylindre, dans une seconde position, au canal de décharge d'air, et pour relier le second espace du cylindre au canal d'alimentation en air comprimé.
PCT/NL1997/000254 1996-05-06 1997-05-05 Cylindre de commande ameliore WO1997041993A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE69719508T DE69719508T2 (de) 1996-05-06 1997-05-05 Verbesserter betriebszylinder
AT97919773T ATE233635T1 (de) 1996-05-06 1997-05-05 Verbesserter betriebszylinder
AU24129/97A AU2412997A (en) 1996-05-06 1997-05-05 Improved operating cylinder
EP97919773A EP0907454B1 (fr) 1996-05-06 1997-05-05 Cylindre de commande ameliore

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1003034 1996-05-06
NL1003034A NL1003034C2 (nl) 1996-05-06 1996-05-06 Verbeterde aandrijfcilinder.

Publications (1)

Publication Number Publication Date
WO1997041993A1 true WO1997041993A1 (fr) 1997-11-13

Family

ID=19762803

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL1997/000254 WO1997041993A1 (fr) 1996-05-06 1997-05-05 Cylindre de commande ameliore

Country Status (8)

Country Link
EP (1) EP0907454B1 (fr)
AT (1) ATE233635T1 (fr)
AU (1) AU2412997A (fr)
DE (1) DE69719508T2 (fr)
ES (1) ES2188937T3 (fr)
NL (1) NL1003034C2 (fr)
PT (1) PT907454E (fr)
WO (1) WO1997041993A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001078934A1 (fr) * 2000-04-13 2001-10-25 Savair & Aro Limited Valves et systemes de regulation pour verins pneumatiques
US6633015B2 (en) * 2000-12-08 2003-10-14 Doben Limited Soft-touch pneumatic drive unit
WO2009000088A1 (fr) * 2007-06-26 2008-12-31 Starcyl Canada Inc. Ensemble vanne pour un dispositif de régulation d'écoulement
US7956308B2 (en) 2005-05-18 2011-06-07 Parker-Hannifin Corporation Weld gun control system
WO2012010939A1 (fr) * 2010-07-20 2012-01-26 Patrick Marcel Strzyzewski Moteur hydraulique, production electrique, air, climatisation, chauffage

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2327488A1 (de) * 1973-05-30 1974-12-12 Daimler Benz Ag Schweisszylinder, insbesondere an vielpunktanlagen zum verschweissen von kraftwagenaufbaublechen
DE3430256C1 (de) * 1984-08-17 1985-11-14 Lothar Schmitt GmbH, 6072 Dreieich Pneumatisch betätigbarer Schweißzylinder
DE4012968A1 (de) * 1990-04-24 1991-10-31 Vbs Vertriebsgesellschaft Fuer Pneumatisch betaetigbarer linearantrieb fuer punktschweiss-automaten
DE9315211U1 (de) * 1993-10-08 1993-12-16 VBS-Vertriebsgesellschaft für Schweißtechnik mbH, 35216 Biedenkopf Pneumatisch betätigbarer Linearantrieb für Punktschweiß-Automaten
DE4328741C1 (de) * 1993-08-26 1994-11-10 Seeger Kolben Gmbh Co Kg Pneumatikantrieb, insbesondere für die Betätigung von Schweißelektroden
EP0628372A1 (fr) * 1993-05-01 1994-12-14 Liv Automation Gmbh Ensemble piston cylindre pour un entraînement pour les dispositifs de soudage

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2327488A1 (de) * 1973-05-30 1974-12-12 Daimler Benz Ag Schweisszylinder, insbesondere an vielpunktanlagen zum verschweissen von kraftwagenaufbaublechen
DE3430256C1 (de) * 1984-08-17 1985-11-14 Lothar Schmitt GmbH, 6072 Dreieich Pneumatisch betätigbarer Schweißzylinder
DE4012968A1 (de) * 1990-04-24 1991-10-31 Vbs Vertriebsgesellschaft Fuer Pneumatisch betaetigbarer linearantrieb fuer punktschweiss-automaten
EP0628372A1 (fr) * 1993-05-01 1994-12-14 Liv Automation Gmbh Ensemble piston cylindre pour un entraînement pour les dispositifs de soudage
DE4328741C1 (de) * 1993-08-26 1994-11-10 Seeger Kolben Gmbh Co Kg Pneumatikantrieb, insbesondere für die Betätigung von Schweißelektroden
DE9315211U1 (de) * 1993-10-08 1993-12-16 VBS-Vertriebsgesellschaft für Schweißtechnik mbH, 35216 Biedenkopf Pneumatisch betätigbarer Linearantrieb für Punktschweiß-Automaten

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001078934A1 (fr) * 2000-04-13 2001-10-25 Savair & Aro Limited Valves et systemes de regulation pour verins pneumatiques
US6633015B2 (en) * 2000-12-08 2003-10-14 Doben Limited Soft-touch pneumatic drive unit
US7956308B2 (en) 2005-05-18 2011-06-07 Parker-Hannifin Corporation Weld gun control system
WO2009000088A1 (fr) * 2007-06-26 2008-12-31 Starcyl Canada Inc. Ensemble vanne pour un dispositif de régulation d'écoulement
US8286543B2 (en) 2007-06-26 2012-10-16 Starcyl Canada Inc. Valve assembly for an actuating device
WO2012010939A1 (fr) * 2010-07-20 2012-01-26 Patrick Marcel Strzyzewski Moteur hydraulique, production electrique, air, climatisation, chauffage

Also Published As

Publication number Publication date
ES2188937T3 (es) 2003-07-01
PT907454E (pt) 2003-07-31
DE69719508T2 (de) 2004-02-19
DE69719508D1 (de) 2003-04-10
AU2412997A (en) 1997-11-26
ATE233635T1 (de) 2003-03-15
NL1003034C2 (nl) 1997-11-07
EP0907454A1 (fr) 1999-04-14
EP0907454B1 (fr) 2003-03-05

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